Hair-spring tester.



A. G. & A. A. HAMM.

HAIR SPRING TESTER.

APPLICATION FILED 00w. 2, 1911.

Patented June 18, 1912.

M M M A v A. A. ///M/P/ Inventors Witnesses Attorneys COLUMBIA PLANOGRAPH CO.,WASHINGTDN, D. c.

ABRAHAM Gr. HAMM AND ABRAHAM ABR. HAIVIM, OF ROSTHEBN, SASKATCHEWAN, CANADA.

HAIR-SPRING :rnsrnn.

Specification of Letters Patent.

Application filed October 2, 1911.

Patented June 18, 1912. Serial No. 652,337.

To all whom it may concern:

Be 1t known that we, ABRAHAM GERHARD I'IAMM and ABRAHAM ABRAHAM I'IAMM, both subjects of the King of Great Britain, and

residing at Rosthern, in the Province of Saskatchewan, Canada, have invented certain new and useful Improvements in Hair- Spring Testers; and we do hereby declare that the following is a full, clear, and exact description of the invention, such aswill en- .able others skilled in the art to which it In the drawings: Figure 1 is a side ele-' vation of the invention, in use; Fig. 2 is a top plan view of the same; Fig. 3 is a perspective view of one of the sinkers; Fig. 4: is a side elevation of a slight modification of the invention; and Fig. 5 is a perspective view of a second form of sinker, for very delicate hair springs.

The main objects of the invention are to provide a simple, eflicient, durable, and economical hair spring tester by which various sizes of hair springs may be quickly and easily tested with absolute accuracy.

Referring to the drawings in detail, 1 indicates a suitable base from which extends a small crane 2 provided with one fixed jaw 3 and a cooperating pivotally mounted jaw l. The jaw 41: is adapted to be held in operative position by means of a clamping screw 5. From each of the jaws projects a small ear 6. Between these ears is clamped the outer end of the spring to be tested. A short distance from the crane .and directly in front of its aws, is a scale post or graduated rod 7 extending upwardly from the base 1. A sinker or weighted rod 8 is provided with a loop 9 on the end of an arm 10 which projects from the head of this rod. The loop is adapted to slide freely on the rod or post 7 and to act as an index needle cooperating with the graduations 'on the rod. This rod 8 is of very small diameter and adapted to slide freely through the inner coil of the hair spring. It is provided with a conical hub 11 concentrically arranged about its upper end and adapted to engage the inner coils of the spring and stretch or extend the spring as therod moves downward. The hub, of course, acts, also, as a weight. The hub in Fig. 5 is smaller in diameter and substantially cylindrical.

In order to guide the rod and insure a true vertical movement of it, a guide bar 12 has been provided. This guide bar is mounted to slide horizontally in the vertical post of the crane 2, so that its operated end may be adjusted into exact alinement with the center of the hair spring which is held between the ears 6. This end is provided with two vertical bores 13 of different diameters. One diameter bore is adapted to slidably receive the lower end of the sinker rod. of Fig. 3 for testing hair springs rangmg between certain gages, whereas, the other is adapted to similarly receive the lower end of the sinker of Fig. 5, for testing exceptionally delicate hair springsmore particularly, Swiss hair springs. On reference to Figs. 4 and 5, it will be seen that the sinker for testing the very delicate springs is arranged with its loop 9 very close to its stem, requiring the graduated post to be much nearer the crane. For this purpose, a second post 14 is, preferably, mounted slightly to one side of the line between post 7 and the crane end, and much closer to the crane end. It will be noticed that the loop 9 of the sinker and the guide rod or bar 12 insure absolute and true vertical movement of the sinker. The loop will indicate by the graduations on the post 7, the exact strength of the hair spring, of course.

It is thought that the operation and use of the invention will be clear from the preceding detailed description.

Changes may be made in the construction, arrangement, and disposition of the several parts of the invention without in any way departing from the field and scope of the same and it is meant to include all such within this application wherein only preferred forms have been disclosed.

Having thus fully described our inven tion, what we claim as new and desire to secure by Letters Patent is:

1. In combination, a crane for holding a hair spring, a graduated post adjacent to said crane and independent thereof, and a sinker cooperating with said graduating post and adapted to engage said spring by the action of gravity.

2. In combination, a crane for holding a hair spring, a graduated post adjacent to said crane, a sinker cooperating'wit-h said ated post adjacent to said crane, a sinker en gaging said spring and a loop extending from 'saidsinker and cooperating with said graduated post.

at. In combination, a crane for holding a hair spring, a graduated post adjacent to said crane, a sinker engaging said spring,

I and a loop extending from said sinker and,

cooperating with said graduated post.

5. I11 combination, a cranefor holding a hair spring, a graduated post adjacent to said crane, a sinker rod provided with a hub and engaging said spring, and a loop extending from said sinker rod and cooperating with'said graduated post.

6. In colnbination, a crane for holding, a

hair-spring, a graduated post adjacent to said crane, a sinker cooperating with said graduated post,'and provided with a downwardly tapering enlarged conical part which enters said spring and bears thereon by gravity.

7. In combination, a crane for holding a hair spring, a graduated'post adjacent to said crane, a sinker engaging said spring by gravity, a loop extending from said sinker and extendmg slldably about said post, and a gulde bar mounted 1n sald crane and adapted to recelve and gu de said slnker.

In w tness whereof we have hereunto set our hands 1n the presence of two witnesses.

ABRAHAM Gr. HAMll/L ABRAHAM ABR. HAMM.

Witnesses:

F. A. KRAUsE, P. S. REMPE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G. 

